EP3331841A2 - Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmium - Google Patents
Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmiumInfo
- Publication number
- EP3331841A2 EP3331841A2 EP16822283.4A EP16822283A EP3331841A2 EP 3331841 A2 EP3331841 A2 EP 3331841A2 EP 16822283 A EP16822283 A EP 16822283A EP 3331841 A2 EP3331841 A2 EP 3331841A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- phosphoric acid
- solution
- cadmium
- source
- fertilizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 45
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000003337 fertilizer Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000004254 Ammonium phosphate Substances 0.000 title claims abstract description 12
- 235000019289 ammonium phosphates Nutrition 0.000 title claims abstract description 12
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 title abstract description 16
- 229910000148 ammonium phosphate Inorganic materials 0.000 title abstract description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 50
- 239000000243 solution Substances 0.000 claims abstract description 46
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 17
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 229910052980 cadmium sulfide Inorganic materials 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 3
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 claims abstract 2
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 12
- 238000001556 precipitation Methods 0.000 claims description 11
- 150000004763 sulfides Chemical class 0.000 claims description 11
- 230000003179 granulation Effects 0.000 claims description 10
- 238000006386 neutralization reaction Methods 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 8
- CJOBVZJTOIVNNF-UHFFFAOYSA-N cadmium sulfide Chemical compound [Cd]=S CJOBVZJTOIVNNF-UHFFFAOYSA-N 0.000 claims description 7
- 230000000295 complement effect Effects 0.000 claims description 5
- ZRIUUUJAJJNDSS-UHFFFAOYSA-N ammonium phosphates Chemical class [NH4+].[NH4+].[NH4+].[O-]P([O-])([O-])=O ZRIUUUJAJJNDSS-UHFFFAOYSA-N 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000002367 phosphate rock Substances 0.000 claims description 2
- 229910052816 inorganic phosphate Inorganic materials 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 14
- 229910019142 PO4 Inorganic materials 0.000 description 8
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 8
- 235000021317 phosphate Nutrition 0.000 description 8
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 7
- 235000019837 monoammonium phosphate Nutrition 0.000 description 7
- 239000006012 monoammonium phosphate Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 7
- 239000010452 phosphate Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229940010556 ammonium phosphate Drugs 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 239000000908 ammonium hydroxide Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- FRLJSGOEGLARCA-UHFFFAOYSA-N cadmium sulfide Chemical class [S-2].[Cd+2] FRLJSGOEGLARCA-UHFFFAOYSA-N 0.000 description 2
- -1 carbonates Chemical class 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 229940095564 anhydrous calcium sulfate Drugs 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 150000003842 bromide salts Chemical class 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229940095672 calcium sulfate Drugs 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002288 cocrystallisation Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000004694 iodide salts Chemical class 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000622 liquid--liquid extraction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/28—Ammonium phosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/08—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using sulfuric acid
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B19/00—Granulation or pelletisation of phosphatic fertilisers, other than slag
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
Definitions
- the present invention relates to a method for producing an ammonium phosphate fertilizer having a reduced cadmium content.
- Phosphate ores are the main source of phosphorus used in soil fertilization and improved crop yields.
- the transformation of rock into fertilizer involves the manufacture of phosphoric acid, which is almost exclusively wet through the acid leaching of ores, the latter gives acids which after processing give fertilizers containing most of the impurities whose cadmium.
- the quality of ores is changing and cadmium, an element with limited fertilizer levels in many countries, may be present in phosphate ores at high levels.
- a decadmination by ion exchange resins two mechanisms can be envisaged: (i) a cationic exchange, which in the case of cadmium requires large towers for reasons of cadmium affinity; large volumes of regeneration solution are also produced and require adequate treatment (ii) anion exchange, which requires the use of halide sources (in particular bromides or iodides) to form high affinity halide / cadmium ions towards the resins used,
- halide sources in particular bromides or iodides
- Ammonium phosphate fertilizers are manufactured by reaction between phosphoric acid and ammonia to form either mono-ammonium phosphate (MAP) or di-ammonium phosphate (DAP) following the reactions:
- the neutralization of phosphoric acid with ammonia is generally carried out in several stages by means of different reaction equipment: stirred tanks, tubular reactors, granulators, etc.
- a first neutralization step generally called a pre-reactor is carried out, the nitrogen / phosphorus (N / P) molar ratio of the slurry produced at this stage is maintained at a value which confers a maximum of solubility with ammonium phosphates.
- This molar ratio is generally adjusted between 1, 4 and 1.5 in the case of DAP and between 0.6 and 0.7 in the case of MAP.
- the slurry thus obtained can be introduced either into an additional reactor generally of the tubular type to undergo a penultimate ammoniation before being sprayed in the granulator-ammonizer, on a bed of recycled product on which ammonia is also sprayed. or introduced directly into the granulator-ammoniator from the pre-reactor without intermediate ammoniation.
- the granulation step is therefore the last ammoniation step accompanying granular shaping by the agitation movement of the bed, generated by the rotation of the granulation equipment. This step also eliminates some of the moisture of the formed product, but an additional drying step in dedicated equipment is generally required. After drying, the product passes through a particle size classification, a stage which also generates the recycled circulating feedstock to the granulator, the conformal particle size product is then cooled and is treated with a coating which makes it possible to improve its physical quality with respect to the generation of dust and / or caking.
- An object of the invention is to overcome the aforementioned drawbacks and to provide a method of manufacturing an ammonium phosphate fertilizer having a reduced content of cadmium that can be implemented on an industrial scale and that does not strike not the cost of the fertilizer.
- a method for producing a phosphate-based fertilizer ammonium from an aqueous phosphoric acid solution having a concentration of less than 50% P 2 0 5 obtained by treating wet phosphate ore, said phosphoric acid containing traces of cadmium comprising the following steps:
- a complementary ammoniation of the clarified solution is carried out so as to obtain a molar ratio N / P determined for obtaining an NP type fertilizer or NPK.
- the concentration of the phosphoric acid solution is between 20 and 50% P 2 0 5 , preferably between 25 and 45% P2O5.
- the molar ratio N / P during step (b) for precipitating cadmium sulphide is between 0.2 and 0.6, preferably between 0.3 and 0.5.
- the sulphide source is used in excess with respect to the amount of cadmium present in the phosphoric acid solution.
- the source of sulphides introduced generally employs between 3 and 15 kg of solid NaHS equivalent per tonne of P 2 0 5 .
- the sulphide source is an aqueous solution of
- reaction step (b) with the sulphide source is carried out in a reactor stirred under pressure.
- reaction step (b) with the sulphide source is carried out in a tubular reactor under pressure.
- step (a) of partial neutralization with ammonia and the step (b) of reaction with the sulphide source can be carried out separately or simultaneously.
- the process comprises, between the separation step (c) and the granulation step (d), a concentration step of the clarified solution.
- Another subject of the invention relates to a fertilizer that can be obtained by the process as described above and characterized in that it has a cadmium content of less than 40 mg / kg P 2 O 5 .
- FIG. 1 is a schematic diagram of the fertilizer manufacturing process according to one embodiment of the invention.
- Figure 2 is a block diagram of the fertilizer manufacturing process according to another embodiment.
- the decadmination process implemented in the present invention is based on a precipitation of cadmium in the form of sulphides during the manufacturing process of fertilizers based on ammonium phosphates.
- Sulphides such as carbonates, oxides and hydroxides, are insoluble salts in water.
- other metallic trace elements also give M n S m precipitates (where M is the symbol of the metal in question, n and m represent the stoichiometric proportions of said metal and sulfur in the precipitate) of very low solubility. Precipitation is, however, very affected by the acidity of the medium.
- the process according to the invention is based on a readjustment of the reaction steps between the ammonia and the phosphoric acid necessary for the manufacture of ammonium phosphate fertilizers, incorporating therein, when the reaction medium favors it, a precipitation step of cadmium in the form of cadmium sulphide.
- the main steps of the manufacturing process are:
- a first reaction step between phosphoric acid and ammonia a first reaction step between phosphoric acid and ammonia.
- the partial neutralization is made up to a molar ratio N / P so as to avoid the formation of ammonium phosphates under the operating conditions of the process.
- a N / P molar ratio of between 0.1 and 0.8 can be used.
- a mineral sulphide source such as an NaHS solution
- a precipitate of cadmium sulphide leading to the formation of a precipitate of cadmium sulphide.
- Figure 1 illustrates an embodiment of said method.
- the starting material is an aqueous solution of phosphoric acid 1, containing up to 50% P 2 O 5 , preferably between 20 and 50% P 2 O 5 , and more preferably between 25 and 45% P 2 O 5 .
- Said solution has a cadmium content that may exceed 150 mg / kg P 2 0 5 .
- Said solution 1 is introduced into a gas-liquid reactor 2 in which gaseous ammonia 3 is also introduced.
- the reactor 2 can be of stirred tank or tubular reactor type.
- the nitrogen / phosphorus molar ratio of the ammoniated acid 4 formed in the reactor 2 is between 0.1 and 0.8, preferably between 0.2 and 0.6, and even more preferably between 0.3 and 0. 5.
- Ammonium acid 4 is then reacted with a sulphide source 6 such as an aqueous solution of NaHS or Na 2 S in a reactor 5 in order to obtain a solution 7. containing a precipitate of cadmium sulphide.
- a sulphide source 6 such as an aqueous solution of NaHS or Na 2 S in a reactor 5 in order to obtain a solution 7. containing a precipitate of cadmium sulphide.
- the sulphide source may be any source of sulphides having sufficient solubility in phosphoric acid to reach the stoichiometric ratio necessary for decadmination.
- the reactor 5 may be of pressure stirred tank type or tubular reactor. As regards rapid reactions, the pre-neutralization and precipitation steps can be carried out simultaneously, the reactors 2 and 5 then being combined.
- the sulphide source is used in excess relative to the amount of cadmium present in phosphoric acid, in order to ensure a precipitation of practically all the cadmium present.
- the amount of solid NaHS is preferably between 3 and 15 kg per tonne of P 2 0 5 .
- the precipitate 9 is separated in a separation device 8 by a known separation technique, such as filtration, decantation or centrifugation.
- the clarified solution 10 obtained at the end of the separation step then undergoes a complementary ammoniation in one or more steps, during granulation in a granulator 11 and / or before, with ammonia in the gaseous state. and / or compressed liquid 13 to achieve the desired N / P molar ratio for the fertilizer 12.
- the granulation in the granulator 11 can be made in the presence of different materials: recycled fertilizer (circulating charge), nutrient sources and trace elements, ballast, additives, etc. according to the procedures in force.
- the granular fertilizer 12 may be a binary fertilizer (of the MAP, DAP, etc.) or ternary (NPK) type if a source of potassium is used during manufacture, said source being added during granulation.
- binary fertilizer of the MAP, DAP, etc.
- NPK ternary
- FIG 2 illustrates an alternative embodiment of the invention.
- the elements identical to those of Figure 1 are designated by the same reference signs and are therefore not described again.
- This variant comprises, after the separation step implemented in the device 8, a concentration by evaporation of the clarified solution 10 in an evaporation device 14.
- the fertilizer obtained has a cadmium content of less than 40 mg / kg P2O5.
- the starting material is an aqueous solution of phosphoric acid titrating 42% P 2 O 5 and containing 61 ppm cadmium (145.2 mg Cd / kg P 2 O 5 ), made by wet sulfuric etching of ore. of phosphate.
- Ammoniation of said solution is carried out to a molar ratio
- the ammoniated acid is then introduced continuously at a rate of 110 g / min with 1. 53 g / min of a 30% by weight solution of NaHS prepared from a solid NaHS at 70% purity (containing approximately 30% of water of crystallization), in a second reactor, of tubular type.
- the residence time in said reactor is 3 min. and the reaction temperature is 80 ° C.
- the fertilizer obtained is characterized by a cadmium content of 19.2 mg Cd / kg
- This second example is to show the effect of the P 2 0 5 concentration of the starting phosphoric acid on the reduction performance of the cadmium content, by comparing the test of Example 1 with two other tests carried out according to the same protocol as in Example 1 but with different concentrations of phosphoric acid.
- Cadmium content (mg Cd / kg P 2 O s ) in 6.4 12.8 19.2
- Cadmium removal efficiency (%) 95.8 91, 3 86.8
- Example 3 The purpose of Example 3 is to study the effect of the molar ratio N / P of ammoniated acid during the precipitation of cadmium sulphides on the decadmination performance of the fertilizer.
- Cadmium content (mg Cd / kg P 2 0 5 ) in 2 -
- Cadmium removal efficiency (%) Table 2 The results presented in Table 2 show that, for the same concentration of starting phosphoric acid, the elimination efficiency of cadmium is better with a high molar ratio of ammoniation (N / P).
- This example takes advantage of the good decadmination performance by the process using a dilute phosphoric acid solution, here with a concentration of 27% P 2 O 5 , and implementing a subsequent concentration, according to the block diagram of FIG. .
- Cadmium content (mg Cd / kg P2O5) of 18.9
- the two pre-ammoniated, NaHS-treated and clarified acids were then concentrated under a vacuum of 0.2 bar.
- Table 4 presents the conditions of the tests and the performances obtained with two clarified solutions: Ref. of example 4.1 4.2
- Cadmium content (mg Cd / kg P 2 0 5 ) in the final product 18.80 2.11 (fertilizer)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL16822283T PL3331841T3 (pl) | 2015-08-03 | 2016-08-03 | Sposób wytwarzania nawozu na bazie fosforanu amonu mającego zmniejszoną zawartość kadmu |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1557483A FR3039830B1 (fr) | 2015-08-03 | 2015-08-03 | Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmium |
PCT/MA2016/000012 WO2017023153A2 (fr) | 2015-08-03 | 2016-08-03 | Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3331841A2 true EP3331841A2 (fr) | 2018-06-13 |
EP3331841B1 EP3331841B1 (fr) | 2021-03-17 |
Family
ID=55759656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16822283.4A Active EP3331841B1 (fr) | 2015-08-03 | 2016-08-03 | Procede de fabrication d'un engrais a base de phosphate d'ammonium presentant une teneur reduite en cadmium |
Country Status (17)
Country | Link |
---|---|
US (1) | US10947164B2 (fr) |
EP (1) | EP3331841B1 (fr) |
CN (1) | CN109071368B (fr) |
AU (1) | AU2016303902B2 (fr) |
BR (1) | BR112018002341B1 (fr) |
CA (1) | CA2993518C (fr) |
EA (1) | EA035357B1 (fr) |
ES (1) | ES2875409T3 (fr) |
FR (1) | FR3039830B1 (fr) |
HK (1) | HK1256723A1 (fr) |
HU (1) | HUE054820T2 (fr) |
IL (1) | IL257286B (fr) |
MX (1) | MX2018001466A (fr) |
PL (1) | PL3331841T3 (fr) |
SG (1) | SG11201800810RA (fr) |
WO (1) | WO2017023153A2 (fr) |
ZA (1) | ZA201800652B (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020247502A1 (fr) * | 2019-06-04 | 2020-12-10 | K-Technologies, Inc. | Processus d'élimination et de récupération du cadmium à partir d'acide phosphorique par voie humide |
SE546282C2 (en) * | 2023-01-27 | 2024-09-24 | Easymining Sweden Ab | Processing of phosphate solutions |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3134847A (en) * | 1962-11-06 | 1964-05-26 | Whitehall Electronics Corp | Angularly adaptive rod antenna mount |
NL7417042A (nl) * | 1974-01-16 | 1975-07-18 | Fisons Ltd | Werkwijze voor de bereiding van ammoniumfos- faten. |
US3974263A (en) * | 1974-04-04 | 1976-08-10 | Fisons Limited | Process for producing ammonium phosphate in two stages |
GB1483739A (en) | 1974-09-13 | 1977-08-24 | Scottish Agricultural Ltd | Manufacture of solid ammonium phosphate |
SE418845B (sv) | 1979-05-10 | 1981-06-29 | Boliden Ab | Forfarande for rening av vatprocessfosforsyra |
FR2481611A1 (fr) | 1980-05-05 | 1981-11-06 | Generale Engrais Sa | Procede de fabrication de produits sous forme de particules solides notamment d'engrais granules np/npk contenant du phosphate d'ammonium |
MA18993A1 (fr) * | 1980-11-07 | 1981-07-01 | Boliden Ab | Methode pour eliminer les metaux lourds dans l'acide phosphorique |
DE3134847A1 (de) * | 1981-09-03 | 1983-03-17 | Hoechst Ag, 6000 Frankfurt | "verfahren zur gewinnung cadmium-freier rohphosphorsaeure" |
NO164768C (no) | 1988-03-04 | 1990-11-14 | Norsk Hydro As | Fremgangsmaate for fjerning av tungmetaller, spesielt kadmium, fra fosforsyreholdige loesninger. |
DE4327401A1 (de) | 1993-08-14 | 1995-02-16 | Hoechst Ag | Verfahren zur Entfernung von Blei und Cadmium aus Phosphorsäure |
FR2755959B1 (fr) * | 1996-11-18 | 1998-12-24 | Kaltenbach Thuring Sa | Reacteur, procede et installation pour la fabrication de sels d'ammoniaque |
SE537780C3 (fr) * | 2013-05-02 | 2015-12-08 | ||
CA2932421C (fr) | 2013-12-02 | 2020-10-20 | Ecophos S.A. | Source de phosphate pour l'agriculture et l'alimentaire |
CN103991853A (zh) * | 2014-05-29 | 2014-08-20 | 龚家竹 | 生产低重金属含量卫生磷肥的方法 |
-
2015
- 2015-08-03 FR FR1557483A patent/FR3039830B1/fr active Active
-
2016
- 2016-08-03 US US15/750,053 patent/US10947164B2/en active Active
- 2016-08-03 BR BR112018002341-8A patent/BR112018002341B1/pt active IP Right Grant
- 2016-08-03 MX MX2018001466A patent/MX2018001466A/es unknown
- 2016-08-03 CN CN201680045317.4A patent/CN109071368B/zh active Active
- 2016-08-03 PL PL16822283T patent/PL3331841T3/pl unknown
- 2016-08-03 ES ES16822283T patent/ES2875409T3/es active Active
- 2016-08-03 WO PCT/MA2016/000012 patent/WO2017023153A2/fr active Application Filing
- 2016-08-03 AU AU2016303902A patent/AU2016303902B2/en active Active
- 2016-08-03 EP EP16822283.4A patent/EP3331841B1/fr active Active
- 2016-08-03 EA EA201890418A patent/EA035357B1/ru unknown
- 2016-08-03 CA CA2993518A patent/CA2993518C/fr active Active
- 2016-08-03 SG SG11201800810RA patent/SG11201800810RA/en unknown
- 2016-08-03 HU HUE16822283A patent/HUE054820T2/hu unknown
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2018
- 2018-01-31 IL IL257286A patent/IL257286B/en active IP Right Grant
- 2018-01-31 ZA ZA2018/00652A patent/ZA201800652B/en unknown
- 2018-12-10 HK HK18115779.5A patent/HK1256723A1/zh unknown
Also Published As
Publication number | Publication date |
---|---|
ZA201800652B (en) | 2019-06-26 |
BR112018002341A2 (pt) | 2018-09-25 |
IL257286B (en) | 2021-06-30 |
EA201890418A1 (ru) | 2018-07-31 |
HUE054820T2 (hu) | 2021-10-28 |
HK1256723A1 (zh) | 2019-10-04 |
US10947164B2 (en) | 2021-03-16 |
CA2993518C (fr) | 2023-08-08 |
AU2016303902A1 (en) | 2018-03-29 |
CN109071368A (zh) | 2018-12-21 |
SG11201800810RA (en) | 2018-02-27 |
US20180222809A1 (en) | 2018-08-09 |
WO2017023153A2 (fr) | 2017-02-09 |
CA2993518A1 (fr) | 2017-02-09 |
BR112018002341B1 (pt) | 2022-11-01 |
CN109071368B (zh) | 2021-11-12 |
EP3331841B1 (fr) | 2021-03-17 |
ES2875409T3 (es) | 2021-11-10 |
EA035357B1 (ru) | 2020-06-01 |
AU2016303902B2 (en) | 2021-03-04 |
WO2017023153A3 (fr) | 2017-03-30 |
FR3039830A1 (fr) | 2017-02-10 |
PL3331841T3 (pl) | 2021-09-27 |
IL257286A (en) | 2018-03-29 |
FR3039830B1 (fr) | 2018-09-07 |
MX2018001466A (es) | 2019-01-31 |
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